fix(install): skip MarkAliasInstalled when alias was already present

Composer's `Transaction::calculateOperations` only emits a
MarkAliasInstalledOperation when the alias isn't already in
`presentAliasMap`. Mirror that here: walk installed.json for each
package being installed/updated, recover its prior alias set (explicit
`extra.branch-alias` entries plus the synthetic `9999999-dev` alias for
`default-branch: true` dev packages), and suppress the trace line when
the new lock's alias normalized version was already there. Avoids the
spurious "Marking ... as installed" emitted on a same-alias dev ref bump.

0 files changed, 0 insertions, 0 deletions